Calculation Of Current Consumption - Mitsubishi Electric NZ2FTGN User Manual

Calculation of current consumption

The current consumption of the slave station is calculated based on the current consumption of each module and devices
connected with the I/O module and the simultaneity factor g.
Calculate the total current consumption of each module and determine whether an additional extension power supply module
is required for the current circuit. When the current consumption will exceed 10A, add an extension power supply module.
For the current consumption of the slave station, the input circuit and output circuit must be calculated separately. (The
system voltage need not be considered.)
Item Description
I The system path for communications with I/O modules.
SYS
Current is supplied from the input power supply of the coupler. It can be supplied to up to 64 I/O modules.
I The path for the external device connected with the input circuit (I
IN
Use the NZ2FTPDI as needed. The current path to the left I/O module of the NZ2FTPDI and the new path from the right module are
separated by the NZ2FTPDI.
I The path for the external device connected with the output circuit (I
OUT
Use the NZ2FTPDO as needed. The current path to the left I/O module of the NZ2FTPDO and the new path from the right module are
separated by the NZ2FTPDO.
Input circuit
The following describes how to calculate the current consumption for the input circuit.
The current consumption of the coupler must be considered, as well as the value multiplied by the current consumption of I/O
modules, current consumption of external devices, and the simultaneity factor g.
Total current consumption = I
• I : Current consumption for the system
SYS
• I : Current consumption for input circuit
IN
• I : Current consumption of connected external devices
S
When using the NZ2FTPDI module, calculate the current consumption of the subsequent I/O modules and the current
consumption of the connected external devices.
Total current consumption = ((I
Output circuit
The following describes how to calculate the current consumption for the output circuit.
The value multiplied by the current consumption of I/O modules, current consumption of external devices, and the
simultaneity factor g must be considered.
Total current consumption = (I
• I : Current consumption for output circuit
OUT
• I : Current consumption of connected external devices
L
2 OVERVIEW OF NZ2FT SYSTEM
32
2.3 Power Supply
coupler
SYS
+ (I + I ) + (I × g) I/O module 1
SYS IN S
+ (I + I ) + (I × g) I/O module 2
SYS IN S
+ Σ((I
+ I ) + (I × g)) I/O module 3 to N
SYS IN S
+ I I/O module X) × g)
IN S
+ ((I + I I/O module Y) × g)
IN S
+ Σ((I
+ I ) × g) I/O module N
IN S
+ (I × g)) I/O module 1
OUT L
+ (I + (I × g)) I/O module 2
OUT L
+ Σ(I
+ (I × g)) I/O module N
OUT L
).
S
).
L